Mastic Trail. This significant trail, used in the 1800s as the only direct path to the North Side, is a rugged 2-mile (3-km) slash through 776 dense acres of woodlands, black mangrove swamps, savanna, agricultural remnants, and ancient rock formations. It embraces more than 700 species, including Cayman's largest remaining contiguous ancient forest (one of the heavily deforested Caribbean's last examples). A comfortable walk depends on weather—winter is better because it's drier, though flowering plants such as the banana orchid blaze in summer. Call the National Trust to determine suitability and to book a guide ($30); tours run daily 9 to 5 by appointment and Thursdays and Fridays at 9 (sometimes earlier in summer). Or walk on the wild side with a $5 guidebook covering the ecosystems, endemic wildlife, seasonal changes, poisonous plants, and folkloric uses of flora. The trip takes about three hours. Frank Sound Rd., entrance by fire station at botanic park, Breakers, East End, Grand Cayman. 345/749–1121; 345/749–1124; www.nationaltrust.org.ky.